When you Hold your finger on lower bottom left part of LCD screen and when you connect zumo to Pc you must still hold screen and quick press and hold power button
When you see in updater window that your unit is recognized release finger from power button but still hold screen and click on OK button in updater.

You can also try this.

Connect unit to Pc and when you see logo quick press finger on lower left corner of screen and press power button with other hand.

p.s.
If you have some older FW on your unit you can also try with this:

- Open battery cover
- add some small magnet beside usb hole on your unit ( this will simulate closed battery door ) Yo can use small magnet for sticker on the fridge
- now folow tutorial from dasilvarsa

Uau!! It worked!! Now I'm in the Mass Storage Mode!!
I deleted the updater file
Should I make another Firmware to substitute the modified firmware or i can run webupdater?
Many thanks!!

Hi Guys,
Your capabilities are very famous and now I got a friend with a Zumo 660 that he deleted all the files.
It goes until Loading Maps and turn off.
I got to put it in Mass Storage Mode following the same instructions that you gave above.
I copied all the files from another Zumo to this and deleted all the maps to try a cure, but it doesn't go ahead. It keeps turning off during Loading Maps.

There are some Motorcycle Groups that we participate. I'm the one that understand a bit more about GPS, so everybody ask my help.

I installed the cure, deleted all the files that you mentioned, and installed the original firmware again, but the zumo keeps looping in the boot. If it is connected the green bar starts and fail, starting again.

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